Superformance
 

Tried out Hornady's superformance 50 grain 22/250 rounds yesterday and I was impressed. I was doing 1/2" groups at 100 yds. I shot off over 40 rounds and strangely my barrel wasn't even that dirty. It's a little pricey but well worth it. I tried a few other brands and didn't even come close to the results that I got yesterday.

Sounds like you found what works for you!! That by itself is an accomplishment. Enjoy.